Furnace



Patented July te, tesi UNI-Tao STATES PATENT' QFFICE rUaNAcn Application filed October 11, 1928.

My invention relates to improvements in furnaces, and the object of the invention is to devise a furnace in which a maximum amount of combustion takes place and a maximum Y amount of heat absorbed and utilized by the furnace for heatingv purposes so that such heat will not be lost by passing to the stack, in which the heat absorbing surfaces of the walls is increased to a maximum, and in which the incandescent fuel of the fire bed is brought into direct contact with the absorbl ing surfaces of the walls, and it consists essentially of the arrangement and construction of parts as hereinafter more particularly ex- ?i plained.

' Fig. 1 is a sectional perspective view of my furnace, the front portion being removed, one wall of the furnace being broken away intermediate of its hei eht to exhibit the interior @0 construction thereo Fig. 2 is a sectional plan View of my vfurnace.

Fig. 3 is a longitudinal sectional view through Fig. 2, intermediately broken awayv of its lengt In the drawings like characters of reference indicate corresponding parts in each figure. 1 indicates the base of a furnace forming an ash pit. y Y

The body of the furnace comprises a front section 2, a rear section 3, and a series of intermediate sections 4f. rl`he front section 1 is hollow and provided with a re door opening 5 and a flue opening 6. The interior of the section 2 is utilized as water space, such water being supplied through the pipes 2x and carried of by the outflow pipe 2 located at the top of the section. rlhe rear section Sis also hollow to form a water space. The inner wall is formed into a series of cylindrical air lues 3x between which yare formed inwardly extending hollow ribs 3 which are substantially arrow shaped in form so as to provide a maximum ,of heatv absorbing surface on each side of each rib.

' The intermediate sections 4 are also hollow, the side wall of each intermediate section being provided with semi-cylindrical channels LJand 4 which with the semi-cylindrii serial No. 311,918.

cal channel of the next adjacent section form cylindrical air tlues extending vertically at each side of thefurnace.

Between the flues are formed hollow ribs 6 which are also arrow shaped in form so as to provide a maximum heat absorbing surfac-e on each side of each rib.

The upperend of all the sections are arched in form as indicated at 7 and the ribs 6 arched around, this portion of the rib being of greater area so as to provide greater heat absorbing surface at the top of the furnace so as to absorb a maximum amount of heat as it passes to the stack.

By this arrangement it will be seen that a fire vpot is formed between the inwardly extending vertical ribs 6 providing -Vshaped spaces between each pair of ribs into which thetire bed enters, the upper portion of the arch above the tire bed level forming a com- -bustion chamber. 1 f

8 and 9 are the grate members of the furnace which are pivotally mounted as indicated at 10 and'll. Between the grate members 8 and 9 I extend a pipe 12 which is uti- 75 lized to heat water for domestic purposes. 13 is a preheating chamber, the bottom of which is provided with perforations 13x and with an end door in the furnace front. 14: is a slide plate suitably operated by a handle 15 and is valso perforated as indicated at 14x, such perforations being moved into a more or less registering position with the erforations 13x so as to control the supply o air passing into the preheating chamber. The hot air in 'the Iash pit 1 utilized to supply' the preheating chambers, such air passing upward through the cylindrical iues 3x and 4x to mix with the gases given off from the fire bed. The sections 4 vare interconnected together by a series of nipples 15 so as to form a continuous water space within all the sections of the furnace.

The curtain walls 16 and 17 are supported, .10 y

as indicated at 17, by means of bolts extending through the lugs formed integral with the body of the furnace into the curtain walls.

When it is desired to feed the furnace with fresh fuel the plate 18 is drawn out through the fu-rnace door opening.

The curtain Walls 16 and 17 are suitably secured to the inwardly extending -ribs 6 and together with the plate 18 serve to direct the hot gases rising from the fire bed laterally to each side thereof and into the interspaces between the ribs 6 and into the cylindrical flues 4X where they mix with the upward fiow of hot air from the preheating chambers, thereby forming a combustible mixture which is ignited by the heat radiating froml the hot fire bed.

By this means the fuel at the sides of the fire bed is ignited and burnt so that the heat thereof is in direct contact with the furnace walls to be absorbed thereby.

The sections 2, 3 and 4 are secured together by suitably located bolts 19 and 20.

21 is an outlet flue leading through the upper portion of the ribs 6 and provided with a series of orifices 22 through which the products of combustion pass so as t0 be carried up the flue ,through the chimney stack.-

The flue 2l leads at its front end through the ribs 6 to the opening 6 provided with a suitable door 6".

A cross wall 23 may be inserted at its ends in any pair of opposing interspaces between the ribs 6 so as to limit the fire space to any size desired in accordance with the season of the year. p

- It will be readily seen by locating the preheating chambers in the ash pit the heat of the air contained in the ashp'it which would otherwise be lost is utilized for heating the air to supply the flues 4X. The amount of air so supplied is controlled to suit all temperatures and all kinds of fuel by means of the slide plate 14, the perforations 14X of which .are brought more or less into registering position with the perforations 13, thus controlling the amount of air passing therethrough.

By the combined use of my curtain wall, preheating air chambers, hot air filles, and means for regulating the air therethrough, an economic combustion of the gases is as- ',sured and the heat distributed in such a way as to be most effective.

the hot air rising upward through the flues 4*, and thereby forming a completely combustible mixture.

It may also be pointed out that by formingmy furnace in sections the furnace may be readily manufactured, such sections being standard so that a furnace of any desired size may be built by simply inserting a greater or less number of sections.

What I claim as my invention is ln a furnace, a body of inverted U-shaped form forn'iiug a central fire pot and combustion chamber thereover, a grate extending across the bottom of the open tire pot, a series of vertical ii ues formed in the Walls of the furnace body at each side of the fire pot, hollow ribs projecting into the lire pot and located between the flues and forming water spaces the interspaces between the ribs communieating with the interior of the iues and with the fire pot and combustion chamber, means for supplying heated air to the lower ends of the fines, a curtain wall located at each side of the fire pot and extending across the open inner side of each interspace above the level of the fire bed and carried by the aforesaid ribs, a removable plate carried between the curtain walls and adapted to be passed outward through the fire door opening and to form directing means whereby the hot gases are directed from the fire bedinto the interspaces between the water spaces to pass inward over said curtain walls into the combustion chamber, a preheating air chamber located at the bottom ends of the flues and within the ash pit and so formed as to receive the hot rays from the fire bed on the walls thereof, and having a perforated bottom and a slide damper provided with perforations to control the size vof the opening' formed by the perforations of the reheating chamber.

HANS CHRISTIAIEi JORGENSEN. 

